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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
1 Hz = 1 oscillation per second = 1 s-1. The period T and the frequency [nu] are related as follows. The velocity of an object carrying out simple harmonic motion can be calculated easily. The positive quantity [omega] xm is called the velocity amplitude and is the maximum velocity of the object. Note that the phase of the velocity and displacement differ by 90deg..